Sandal upper



FIG. 1 is a left side elevational view of the sandal upper embodying the new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a front elevational view thereof.

The small dashed lines represent claimed stitching. The dash dot dot dash lines illustrate environmental structure and form no part of the claimed design. 

The ornamental design for a sandal upper, as shown and described. 